Nail-driving machine



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G.-S. GOODING & S.-W. LADD.

- V v NAIL DRIVING MACHINE. No. 441,482.

Patented'Nov. 25, 1890.

NVEN TE] WTN ESSESI WW4 M UNITED STATE PATENT OFFICE. Y

CHARLES s. eoonmc, or BROOKLINE, AND SHERMAN w. LADD, or SOMER- VILLE, MASSACHUSETTS. I

NAIL-DRIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 441,482, dated November 25, 1890.

Application filed May 9, 1889- Serial No. 310,201. (No model.)

To all whom, it may concern.-

Be it known that we, CHARLES S. GOODING and SHERMAN WV. LADD, of Brookline and Somerville, respectively, in the Commonwealth of Massachusetts, have invented certain Improvements in Tack and Nail Driving Mechanism, of which the following, taken in connection with the accompanying drawings, is a specification.

[O This invention relates to mechanism for driving tacks and nails, and in the accompanying drawings Figure 1 represents the top part of a supporting-standard, a driving-spring inclosed therein and a portion of the driving- I5 rod. Fig. 2 is a central longitudinal section of said Fig. 1, showing the driving-spring inclosed in its retaining case or barrel. Fig. 3 is a front end elevation of Fig. 1, and Fig. 4 is the reverse view of Fig. 3. Fig. 5 is a crosssection on line .5 5 of Fig. 2, and Fig. 6 is a cross-section at 6-6 of .Fig. 2. Fig. 7 is a front end elevation, the same as Fig. 3, and further shows the driver-rod, its lifting-cam, and the tack-supporting mechanism.

The working parts of this mechanism are mounted upon a column A. Said column supports a shaft a, which is journaled in the supporting-column and carries on one end a pulley for receiving the driving-power where- 0 by the shaft is made to revolve. Said shaft carries on its forward end the cam B, which engages with and lifts the hammer-rod b. To that end the hammer-rod is arranged to permit vertical movement in suitable ways 0.

Said hammer-rod engages at its top end with the arm E, (see Fig. 3,) and said arm is fixed on one end of a spring-rod H, so that the lifting of the hammer-rod raises the arm E and operates to twist the rod H to the end that when the lifting-cam permits it the hammerrod is driven downward by the torsional spring-tension of rod H. This, it will be understood, is the power which drives home the tack or nail, which to that end is previously introduced under the end of the hammer-rod.

The spring-rod H is located in a tubular case h, Fig. 2, which supports in one end the journal-stud of arm E, as shown. In the 0pposite end of said case is journaled the plate N. Said plate is made to receive the end of spring H, which is secured in place thereto by a suitable screw, Fig. 2, and the plate is further provided with a slot '11, Fig. 4:,through which slot a screw m, Fig. 2, is passed, as shown, for clamping the plate-securely to the case h.

In operation the rod H is set into the block N and fixed thereto by screw 8, whereupon the plate is turned partially and secured in position by the screw m giving a partial twist to the rod [-1 and developing a tension thereof which bears constantly downward the driverrod b, and when the driver-rod is lifted by cam B it lifts against this downward pressure of spring H. The uplifting of the hammerrod operates through the lever-arm E to further twist the rod H, and by such additional twist the driving force is developed in the rod H to the end that when the driver reaches its extreme downward throw there remains a reserve force in the spring H, whereby the operation of driving the tack to its extreme position is secured. The driving force obviously depends upon the size of rod H and the tension imparted thereto by twisting it through the operation of turning-plate N, as described, and the desired tension having been determined the plate N is secured by clamp-screw m to the inclosing-ease h. Said clamp-screw m operates through a slot n in the plate, to the end that the plate may be clamped when turned more or less, giving more or less tension, as occasion requires.

WVe are aware that spiral springs have been used in nailing-machines to actuate the hammer-rods; but it is well known that such springs are less prompt and positive in their action than torsion-springs 1, and for these reasons they are less desirable for the purposes of the present invention.

This invention may be used in'connection with a mechanism whereby tacks or nails are gathered and distributed one by one under the hammenrod against the arm E, whereby 10 the driver or in connection with any mechanthe arm is lifted and the rod I'I twisted, subisln Where aqniclc sharp blow is wanted. stantiall y as and for the purposes described.

We claim 5 In a machine for driving tacks or nails, the CHAS. S. GOODING.

rod H, combinedwith an outer casing, as h, a SHERMAN \V. LADD. lever-arm E, joni-naled in said casing and Witnesses: engaging the rod II, a movable hammer-rod G. B. TUTTLE,

engaging the arm E, and means for moving E. E. I'IAMILL. 

